Convert more Android.mk files to Android.bp

These modules have their dependencies satisfied, and aren't doing
anything strange.

Change-Id: I72039a15256cbd5e5eee0d79a15d66d74a6c087d
diff --git a/adf/Android.bp b/adf/Android.bp
new file mode 100644
index 0000000..b44c296
--- /dev/null
+++ b/adf/Android.bp
@@ -0,0 +1 @@
+subdirs = ["*"]